Shock-absorber for drilling-rigs.



J. G. LINDSAY.

SHOCK masonazn FOR DRILLING mes.

APPLICATION FILED JUNE 4. 1917.

Patented Apr. 23, 1918.

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JOSEPH LINDSAY, OF BARTLESVIIJLE, OKLAHOMA.

snocK-nesonenn roe DItILLING-RIGS.

LQUAISI.

Application filed J une 4, 1917.

To all whom it may concern:

Be it known that I, JOSEPH G. LINDSAY, a citizen of the United States, residing at Bartlesville, in the county of Washington and State of Oklahoma, have invented certain new and useful Improvements in Shock- Absorbers for Drilling-Rigs; and I do declare the fOllOWiIlg to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to devices for relieving the strains on derricks of drilling rigs during the operation of boring deep wells.

An object of my invention is to do away with the jerk or snap on the cable, that in time causes it to wear and finally break.

Another object is to take the strain ofl of the derrick when the cable starts to hoist the boring bit or drill from the well hole.

Still another object is to provide means for taking up the shock and strain on derricks of drilling rigs that may be readily at tached and inexpensive to manufacture.

With these and other objects in view, the invention resides in the novel features of construction, combination and arrangement of parts which will be more particularly described and claimed and shown in the drawings wherein:

Figure 1 is a side elevation;

Fig. 2 is an end elevation;

Fig. 3 is vertical sectional view on an enlarged scale;

Fig. 4 is a horizontal sectional view on the line 4-4 of Fig. 3; and,

Fig. 5 is a detail horizontal sectional view.

In the accompanying drawings wherein similar reference characters are used throughout the several views to designate corresponding parts, a housing or frame 1 I is provided at its top with a cross bar 2,

adapted to be connected to one end of a walking beam in any desired manner.

A temper screw 4 works in a slot in said frame 1, passing through the threaded lower end portion of the frame. A divided nut 5 is provided near the lower end of the frame, whereby the temper screw may be quickly raised. A cross bar 6 is formed integral with the lower part of the temper screw thereby Specification of Letters Patent.

Patented Apr. 23, ISIS.

Serial No. 172,788.

forming a handle, whereby said screw may be turned. Below the cross bar 6 there is a boss formed integral with the screw to provide a bearing surface for the top of the swivel bar 8.

A winged swivel. bar 8 is provided which has its center portion 9 on each side extending outward. An opening 10 of suitable size to take spring 11 is bored part way through the under side of the center portion of said swivel bar, thereby forming a seat for said spring to engage on. It will be seen that placing the spring in the socket in such a manner will protect it from all kinds of weather which might cause it to lose its resiliency. A hole 12, large enuogh for the temper screw A to pass through is bored through the remaining portion. Suitable clamping means 14 may be attached by means of rings 15 to the swivel bar. A nut 16 is used to hold the parts in place, said nut being of less diameter than that of the opening 10 thereby permitting a maximum vertical movement.

In putting the device together, the temper screw is passed through its housing or frame, so that part of it extends out below the lower end of said frame. The swivel bar is then passed over the temper screw and the spring inserted in its socket and over the temper screw. The placing of the nut on the screw will hold the parts together. The cable is clamped tight and the device is ready to operate.

It will be seen that when the cable is pulled upward, that there will be a strain put on it, owing to the weight of the drill and the length of cable in the ground. The spring in the swivel bar will be compressed when the strain begins and will therefore act as a shock absorber and will take up the strain that otherwise would wear out the cable.

I claim:

In combination with a temper screw havingthreaded upper and lower portions, a pair of integral turning arms disposed between said threaded portions, a swivel bar loose on the lower portion of the screw having a socket formed in its bottom to provide,

a housing, a spring disposed on the lower threaded portion of said screw having its In testimony whereof I have hereunto set upper end in said housing in the swivel bar, my hand in the presence of two subscribing the lower end of the spring bein held by a witnesses.

nut, said -nutvsformiug means o nelljustn;g JOSEPH G.LINDSAY. 5 the tensionvon saidfspri ng a housingifor'the ".Witnesses:

temper screw and a clamp on the lowereeud J- O. BUCHTA,

thereof to hold a drjlLea ble. .,J. 5.,BARLOW.

copies of this patent may be,gbtgtueiior. fiwe eents eaeh byv.a;1 1res ing. the Commissioner of Patents,

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